Stone Temple Pilots, the vastly influential ’90s alt-rock quartet, has long had a tempestuous relationship with its lead singer, Scott Weiland. The band has been broken up more often than it’s been together with most of its problems stemming from Weiland’s much-publicized battles with substance abuse.

Last year, when the reunited band toured following a lengthy hiatus, including a rather potent performance at the Rapids Theatre in Niagara Falls, one was tempted to assume that STP’s troubles were part of the past. Yet during that Niagara Falls tour stop, cracks in the facade were evident. Weiland seemed to be struggling, though he sang very well. Those cracks became a chasm earlier this week, when the other three members of STP officially “terminated” Weiland from the band.

Whether or not this ends up sticking, a new Weiland solo album is forthcoming, and a tour with Weiland fronting a new band has taken to the road, performing Stone Temple Pilots’ first two, and arguably most inspired, efforts, “Core” and “Purple,” in their entirety.

Weiland brings his “Core/Purple” tour to the Rapids Theatre (1711 Main St., Niagara Falls) at 8 p.m. Monday. Tickets are $35 advance, $40 day of show (box office,, Terrapin Station, Record Theatre).

– Jeff Miers